Syntax I - Assignment 2:	Grammar

Consider the following Phrase Structure Grammar:

S  ->  NP VP

NP ->  {(D) (AP)* N}
       {    pn     }

PP ->  P NP

VP ->  V (NP) (PP)

AP ->  (Deg) A

Together with a Lexicon:
(You may add items to the lexicon at will)

N = farmer, duck, monkey, window, vacuum, lack, ...
V = stab, appear, run, die, assemble, triangulate, ...
D = a, the, my, ...
A = good, bad, ugly, mean, bold, spotted, ruthless, ...
P = in, on, at, beside, under, through, ...
Deg = very, somewhat, rather, really, ...
pn = I, me, you, he, she, it, we, us, they, them

1.  Write three sentences that are consistent with (generated by) this grammar.
    Draw their Phrase Structure trees.

2.  Write three grammatical sentences that are not generated by this grammar.

3.  For at least one of these, revise the grammar so that it does generate
    that sentence.  Then draw its tree, according to the new grammar.

    In this part, explain carefully why you propose the change that you do,
    discuss the class of new sentences that will be generated by your new
    grammar, and explore whether your new grammar generates any new
    ungrammatical sentences.  If it does, talk about what you think you
    might have to do about them.

4.  Write three ungrammatical sentences that are generated by the originally
    given grammar.

5.  For at least one of these, propose a revision to the grammar so that
    the revised grammar will not generate the ungrammatical sentence.

    In this part, explain carefully why you propose the change that you do,
    discuss the class of ungrammatical sentences that will no longer be
    generated, and explore whether your new grammar now fails to generate
    any grammatical sentences that it generated before.  If it does, talk
    about what you think you might have to do about that.